Difference between revisions of "Discriminator output"
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*[[media:Bc996discriminatortap.jpg|BCD996 Discriminator tap point]] | *[[media:Bc996discriminatortap.jpg|BCD996 Discriminator tap point]] | ||
*[[media:Bc996discriminatortap.jpg|BCT15 Discriminator tap point]] | *[[media:Bc996discriminatortap.jpg|BCT15 Discriminator tap point]] | ||
| − | * | + | **NOTE:''' Look dead center of the circuit board, then go right and down. Both the 996 and BCT15 appear to share the same tap point location. |
Revision as of 20:10, 28 February 2015
The Discriminator output from a scanner is the raw, unfiltered signal that a scanner produces before it is sent to the audio stage for output through the speaker -- also called the "baseband audio." This discriminator source is required for applications such as Trunker, T4Win, UniTrunker, and DSD. Most scanners must have a simple modification made to them to feed the discriminator output to Data Slicers, or in the case of UniTrunker, a soundcard.
Note that for providing a signal for ACARS decoding, a connection from an earphone or speaker output is all that's required. This is because ACARS runs at a much lower speed, and the discriminator is not involved in AM reception.
Modifications
Also see the Scandata faq q2 article for a list of older scanners' tap points. This is from an original article by the late Bill Cheek.
Uniden
- BC-245 Discriminator Tap
- JPEGs of BC246 discrim tap
- BC296D/UBC 3300XLT
- BC350A Discriminator Tap
- BC350C Discriminator Tap
- BC-396T Discriminator Tap
- NOTE: You must be a member of the BCD396T Yahoo to view this message.
- The JPEG for the discriminator tap can be viewed here
- BC-780 Discriminator Tap
- BC785D Discriminator Tap
- BC796D Discriminator Tap
- BC895XLT Discriminator Tap
- BCD996 Discriminator tap point
- BCT15 Discriminator tap point
- NOTE: Look dead center of the circuit board, then go right and down. Both the 996 and BCT15 appear to share the same tap point location.
Radio Shack
- Pro-93 Discriminator Tap
- Pro-95 Discriminator Tap
- Pro-96 Discriminator Tap
- Pro 97 Discriminator Tap
- Pro-106 Discriminator Tap
- Pro-164 Discriminator Tap
- Pro-2052 Discriminator Tap
- Pro-2053 Discriminator Tap
- Pro-2066 Discriminator Tap
Other Radios
Why use a resistor and/or capacitor ?
See #6 through 8 of this URL: Discriminator.nl FAQ
Wikipedia Page showing Circuit and calculations for Discriminator Tap.
Links
These pages or links contain more information on discriminator taps for many brands and models of scanners, including older models